I have several freezers and buy in bulk from a local meat processing plant, raw dog food co-op, I watch for sales for the cheaper cuts like pot roast, boneless round steak and stock up. I order some things online from
http://www.hare-today.com/ like green tripe, beef lung, whole rabbits. Beef heart and tongue are cheap around here so I get plenty of those too. Ethnic stores have good prices on lamb and such. I also have several friends who are deer hunters and tell them I will take anything they don't want and take any freezer burned older venison meat from them too. I've gotten almost entire deer this way from one fellow who enjoys the hunt but only wants a couple select cuts for himself. I wish I could talk them into bringing me the green tripe but none of them will mess with it. They do bring me any other organs I want so I always ask for lungs, trachea, heart if they dont want it, liver etc. and I get tons of legs which are good for recreational chews and teeth cleaning with all the fur, tendons and hooves. I take them away once she is down to the bare bones. (Goose hunters are a good free source too even though not red meat, many cut out the breast and leave the rest) Also mention to all friends that you feed raw. A friend of ours just filled a freezer with a new beef and he gave me all they had left from their last beef, he also gave me some new cuts he didn't want, plus the tongue and heart and a fifteen lb turkey (his wife had bought several on sale the year before and never used them all). All so he had room for the new beef.